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Defining the Transcriptional Control of Pediatric AML Highlights RARA as a Super-Enhancer Regulated, Druggable Dependency

ABSTRACT: Defining the Transcriptional Control of Pediatric AML Highlights RARA as a Super-Enhancer Regulated, Druggable Dependency

PROVIDER: PRJNA650394 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12369838.fastq.gz	Fastqsanger.gz
	SRR12369839.fastq.gz	Fastqsanger.gz
	SRR12369840.fastq.gz	Fastqsanger.gz
	SRR12369841.fastq.gz	Fastqsanger.gz
	SRR12369842.fastq.gz	Fastqsanger.gz

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Defining the Transcriptional Control of Pediatric AML Highlights RARA as a Super-Enhancer Regulated, Druggable Dependency

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RARA haploinsufficiency modestly influences the phenotype of APL.

Project description:RARA haploinsufficiency is an invariable consequence of t(15;17) reciprocal translocations in acute promyelocytic leukemia (APL). Furthermore, retinoids and RARA activity have been implicated in hematopoietic self-renewal, lineage commitment and neutrophil maturation. We and others therefore predicted that RARA haploinsufficiency would contribute to APL pathogenesis. To test this hypothesis we crossed RARA+/- mice with mice expressing PML-RARA from the Cathepsin G locus (mCG-PR). We found that RARA haploinsufficiency cooperated with PML-RARA, only modestly influencing the pre-leukemic and leukemic phenotype. Bone marrow from mCG-PR+/- x RARA+/- mice had decreased numbers of mature myeloid cells, increased ex vivo myeloid cell proliferation and an increased competitive advantage following transplantation. RARA haploinsufficiency did not alter mCG-PR dependent leukemic latency or penetrance, but did influence the distribution of leukemic cells; mCG-PR+/- x RARA+/- mice presented more commonly with low to normal white blood cell counts and with myeloid infiltration of lymph nodes. APL arising in these mice was responsive to ATRA, and had virtually no differences in expression profiling compared to tumors arising in mCG-PR+/- x RARA+/+ mice. These phenotypes were dependent on PML-RARA activity, since they were not detected in RARA+/- mice in the absence of the mCG-PR transgene. These data show that RARA haploinsufficiency (like PML haploinsufficiency and RARA-PML) can cooperate with PML-RARA to influence the pathogenesis and phenotype of APL in mice, but that PML-RARA is the driver of t(15;17) APL.

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Effect of PML/RARA on the transcriptome of preleukemic early promyelocytes vs PML/RARA-Flt3ITD leukemic promyelocytes

Project description:Transcriptional profiling of murine cells expressing PML/RARA at the early promyelocyte stage (4 weeks old, preleukemic) and in full blown PML/RARA leukemia generated by transducing PML/RARA bone marrow with a Flt3-ITD retroviral vector

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mCG-PML-RARA alters multipotent hematopoiesis.

Project description:Acute promyelocytic leukemia (APL) is associated with PML-RARA expression and late myeloid maturation arrest. The myeloid restriction of PML-RARA dependent leukemia has been recapitulated in multiple mouse models of APL, including PML-RARA expressed from the Ctsg locus (mCG-PR). However, we report here that Ctsg expression is not limited to promyelocytes (as had previously been thought); Ctsg RNA is detectable in KLS cells, and mCG-PR mice express PML-RARA within the same compartment, an event that alters multilineage hematopoiesis. However, these animals only develop myeloid leukemia (consistent with the myeloid restriction of human PML-RARA-associated leukemia). Our results suggest that APL is shaped by myeloid- and development-specific factors that define the ultimate leukemic phenotype rather than PML-RARA acting in a committed myeloid precursor.

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RARA haploinsufficiency modestly influences the phenotype of APL.

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Expression and function of PML-RARA in the multipotent hematopoietic progenitor cells of Ctsg-PML-RARA mice

Project description:Because PML-RARA-positive acute promyelocytic leukemia (APL) is a morphologically differentiated leukemia, much speculation has been made about whether its leukemic cell of origin might be committed myeloid precursor (e.g., a promyelocyte) vs. a hematopoietic stem/progenitor cell (HSPC). We originally targeted PML-RARA expression with CTSG regulatory elements, based on the early observation that this gene was maximally expressed in cells with promyelocyte morphology. Here, we show that both Ctsg and PML-RARA targeted to the Ctsg locus (in Ctsg-PML-RARA mice) are detected in the purified KLS cells of these mice (Kit+Lin-Sca+ cells, which are highly enriched for HSPCs), and this expression results in biological effects in multi-lineage competitive repopulation assays. Although PML-RARA is indeed expressed at high levels in the promyelocytes of Ctsg-PML-RARA mice, it does not significantly alter the transcriptional signature of these cells, or induce their self-renewal. In sum, these results suggest that in murine models, PML-RARA acts primarily to affect the function of multi-potent progenitor cells, rather than promyelocytes. Since PML/Pml is normally expressed in the HSPCs of both humans and mice, and since some human APL samples contain TCR rearrangements and express T lineage genes, we suggest that the very early hematopoietic expression of PML-RARA in our mouse model may closely mimic the physiologic expression pattern of PML-RARA in human APL patients.

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